PostgreSQL 9.2.0 Change Log

# Major enhancements include:- Allow queries to retrieve data only from indexes, avoiding heap access (index-only scans)- Allow the planner to generate custom plans for specific parameter values even when using prepared statements- Improve the planner's ability to use nested loops with inner index scans- Allow streaming replication slaves to forward data to other slaves (cascading replication)- Allow pg_basebackup to make base backups from standby servers- Add a pg_receivexlog tool to archive WAL file changes as they are written- Add the SP-GiST (Space-Partitioned GiST) index access method- Add support for range data types- Add a JSON data type- Add a security_barrier option for views- Allow libpq connection strings to have the format of a URI- Add a single-row processing mode to libpq for better handling of large result sets

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